Hi…
I’m totally new in the section, working with CS-CART.
-First of all, can I find somewere a manual in german?
-Is it possible, to reset all changes, and start with like it was, when we got it from the factory?
-In the catalog box, the buttens
I am somewhat new too, but I may be able to answer atleast one question until someone more experienced comes a long. As far as “reseting changes”, if you are talking about in your template editor, click on the file you want to “reset” and then in the upper right corner there will be an option to “restore from repository”…that will restore it for you!! Not sure about the buttons, how do you know they are missing? My only guess is that they didnt upload correctly, but dont take my word on it 
Make sure you have the correct user permissions.
Users → Merberships → administrator → privileges